Related Experiment Videos
Effect on fusion induction of point mutations introduced into the F protein of mumps virus
K Tanabayashi1, K Takeuchi, M Hishiyama
1Department of Viral Disease and Vaccine Control, National Institute of Health, Tokyo, Japan.
Abstract:
We have tested the effect of substitution of an amino acid at position 195 of the F protein of mumps virus on cell-to-cell fusion caused by the virus. Introduction of amino acids with aromatic side chains into this position resulted in reduction of fusion induction. Furthermore the F protein was not cleaved when the amino acid at this position was substituted by several amino acids, suggesting that the amino acid at this position was essential to keep the tertiary structure of the protein that might be required not only for proper folding of the protein but also for induction of membrane fusion.
Insights
Amino acid substitutions at position 195 of the mumps virus F protein can reduce cell-to-cell fusion. This position is crucial for protein folding, cleavage, and membrane fusion induction.
Area of Science:
- Virology
- Molecular Biology
- Cell Biology
Background:
- Mumps virus causes cell-to-cell fusion via its F protein.
- The F protein's structure and function are critical for viral pathogenesis.
Purpose of the Study:
- To investigate the impact of amino acid substitutions at position 195 of the mumps virus F protein on cell-to-cell fusion.
- To determine the role of this specific amino acid residue in F protein processing and function.
Main Methods:
- Site-directed mutagenesis was used to introduce various amino acid substitutions at position 195 of the mumps virus F protein.
- Cell-to-cell fusion assays were performed to quantify the fusion-inducing activity of the modified F proteins.
- Western blotting was employed to assess the cleavage of the F protein.
Main Results:
- Substitution of position 195 with amino acids possessing aromatic side chains significantly reduced fusion induction.
- Several substitutions at position 195 prevented the proper cleavage of the F protein.
- These findings suggest that the amino acid at position 195 is essential for maintaining the F protein's tertiary structure.
Conclusions:
- The amino acid at position 195 of the mumps virus F protein plays a vital role in mediating cell-to-cell fusion.
- Proper folding and cleavage of the F protein, influenced by residue 195, are necessary for its fusogenic activity.
- Targeting this residue could offer a strategy for controlling mumps virus spread.